Réponses

  • Omnes
  • Modérateur confirmé
2014-05-19T18:28:37+02:00
Salut,

(2x-5) (1+x)=2x(x-3)
2x + 2x² -5 -5x = 2x² - 6x
2x² - 3x - 5 - 2x² + 6x = 0
3x - 5 = 0
3x = 5
x = 5/3

2014-05-19T18:35:22+02:00
(2x - 5) (1 + x) = 2x (x-3)
2x * 1 + 2x * x -5 * 1 - 5 * x = 2x * x + 2x * 3
2x + 2 x^{2} - 5x - 2 x^{2} + 6x = 5
2x + 2 x^{2} - 5x - 2 x^{2} + 6x = 5
3x = 5
x =  \frac{5}{3}                                                           * = fois